Camshaft having adjustable cams that can be oiled by means of pressure oil

摘要

The invention relates to an adjustable camshaft for the valve gear of an internal combustion engine, comprising an outer shaft, on which at least one first cam is arranged and connected to the outer shaft in a rotationally fixed manner, and an inner shaft extending through the outer shaft, to which inner shaft at least one second cam is connected in a rotationally fixed manner, wherein the second cam connected to the inner shaft in a rotationally fixed manner has a cam hole and is rotatably supported on a seating point on the outer shaft. According to the invention, at least one oil groove is introduced at the seating point in the outer shaft and/or in the inner wall of the cam hole, into which oil groove oil is guided from a gap between the outer shaft and the inner shaft through at least one passage extending through the outer shaft.

主权项

1. An adjustable camshaft for a valve gear of an internal combustion engine, comprising:
a tubular outer shaft defining an open passage extending through a wall thereof; at least one first cam disposed on, and coupled to, said outer shaft so as to prevent rotational movement of said first cam with respect to said outer shaft; an inner shaft extending through an interior of said tubular outer shaft, said inner and outer shafts being rotatable with respect to one another about a longitudinal rotation axis; at least one second cam having a cam bore defined there through and coupled to said inner shaft so as to prevent rotational movement of said second cam with respect to said inner shaft, said at least one second cam further being rotatably mounted through said cam bore onto an outer surface of said outer shaft at a seating point thereof; at least one oil groove defined in at least one of an outer surface of said outer shaft or an inner surface of said cam bore of said second cam, at a location of said seating point on said outer shaft; a peripheral gap defined between said outer shaft and said inner shaft, said peripheral gap configured to permit oil to flow between said outer shaft and said inner shaft to said open passage in said wall of said outer shaft, through said open passage, and into said at least one oil groove, so as to provide lubrication between said at least one second cam and said outer shaft upon rotational movement there between.